SM-MM Optical Splitters at a Glance Allows re-use of multimode fiber cabling

Available in 2x8, and 2x16 splitter versions

Optional support for Type-B PON protection

Eliminates cost of new singlemode fiber

28dB optical budget from OLT to ONT

Splitter to ONT MM fiber reach up to 550 m

OLT to splitter SM fiber reach (w/o patch panel) 2x8 20km and 2x16 10km

Supports OM1, OM2, OM3, and OM4 cable

No power, no monitoring nor maintenance

See Tellabs.com for more information about Tellabs Optical LAN Solutions. 1

Tellabs® FlexSym™ Singlemode to Multimode Optical Splitter Better Flexibility and Economics with SM-MM Optical Splitter Options.

Passive Optical LAN (OLAN), which is predominantly implemented over singlemode fiber cabling inside buildings and across a campus, is not directly compatible with multimode fiber cabling. This is because many modes (i.e. shapes of light) propagate in the multimode fiber. Without control, these shapes degrade the performance of data transmission at high bit rate. Tellabs has partnered with industry leading photonic solutions provider that has developed a light shaping technology that controls how light propagates in such multimode fibers. Therefore, the intrinsic limitations of multimode fibers are mitigated and operations between singlemode and multimode fiber are made possible [Diagram 1]. This means that the coupling between singlemode and multimode fibers within an optical splitter is now enabled for OLAN. Locating this mode adaptation technology at the passive optical splitter is ideally positioned within the network as the optical splitter is one of the most important elements of a Passive Optical Network (PON) as it splits (downstream) and combines (upstream) the PON transmission wavelengths (both ITU-T 984 G-PON and ITU-T 989 XGS-PON).

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The purpose of this overview is to provide additional details concerning Passive Optical LAN using the Tellabs® FlexSym™ Singlemode to Multimode Optical Splitters (SM-MM optical splitter) in buildings and across campuses, such as: Improved Economics Better Flexibilities Use Case Examples And, What Else is Possible?

Improved Economics PON has historically taken advantage of single mode fiber cabling inherent supremacy. However, multimode fiber cabling does exist inside buildings and across a campus. It is common to find multimode cabling in a building’s raiser, horizontal and drop pathways. That meant that an upgrade to OLAN was burdened with the time and expense required to replace all the multimode fiber to singlemode fiber. The additional expense of replacing the multimode fiber with singlemode fiber often hurt the economics of the OLAN upgrade. The Tellabs FlexSym Optical Splitters directly improves the business case of upgrading an existing infrastructure that has multimode fiber cabling, for example: Leverage existing multimode cabling Graceful migration to future speeds A purely passive solution Leverage existing multimode cabling – It is highly probable that over time many different versions of multimode cabling has been installed in the data centers, telecom rooms and pathways. Fortunately, the SM-MM optical splitter supports all types of multimode fiber cabling. Thus, OM1, OM2, OM3 and OM4 multimode fiber cables types can all be leveraged, repurposed and reused.

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Graceful migration to future speeds – The SM-MM optical splitters supports operating wavelengths from 1260 nm to 1625 nm. That means that the SM-MM optical splitter can be used for both 2.5 gigabit ITU-T 984 G-PON (1490 nm downstream, 1310 nm upstream) and 10 gigabit ITU-T 989 XGS-PON (1577 nm downstream, 1270 nm upstream) installation. This protects your investment in the SM-MM optical splitter and ensures its continued operations with future generations of PON. A purely passive solution – Being a purely passive device means that the SM-MM optical splitters consume no energy and emit no thermals. The passive nature also makes them highly reliable devices. And better yet, the SM-MM optical splitters require no monitoring, nor maintenance, thus introducing zero additional costs to existing IT operations.

Better Flexibilities Local area network infrastructure comes in many variations, and often evolves over time for better and worse. Therefore, providing IT professionals with design flexibilities to accommodate is crucial. The SM-MM optical splitters deliver many networking options and choices, such as: • Connector and split choices • Option for Type-B PON protection • Reach considerations • RF video overlay option Connector and split choices – The SM-MM optical splitter can be equipped with either SC/UPC, LC/UPC or ST/UPC connectors. The split ratio for the SM-MM optical splitter can be 2x8, or 2x16. It is best to consult the online Tellabs’ SM-MM optical splitter data sheets to confirm the connectors and split ratio choices that are currently available.

Diagram 1.

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Use Case Examples A graceful migration from multimode to singlemode fiber cabling can be accommodated over time. Perhaps your facility committed to multimode fiber-to-the-desktop many years ago? Maybe there is multimode fiber cabling in the risers and to the telecom closets. And, possibly you are not ready to remove either the multimode nor the CATx copper cabling in the final access drops of the LAN. Either way, we can offer flexibility in tackling many different scenarios, such as. Closet-based switch replacement Extended deep fiber (or zone enclosure design) Campus wide reach Closet-based switch replacement – In this scenario the OLT sits in main data center with the MDF, singlemode fiber runs between main data center to the telecommunications closets and multimode fiber is utilized within the telecom closet plus IDF. CATx copper cable is left in place across the final 100m drops through the access portion of the network. The Tellabs SM-MM optical splitter is positioned in the telecom closet along with the Tellabs closet-based ONTs are used (e.g. ONT729GP) [Diagram 3].

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Option for Type-B PON protection – If fiber route diversity, and equipment redundancy (at port, card or OLT), is desired, then Type-B PON protection can be deployed with either the 2x8, or 2x16 SM-MM optical splitters. For the highest possible network availability, two Optical Line Terminals (OLT) at geographically dispersed locations can also be configured to serve one ONT with two paths across a redundant optical plant utilizing Type-B PON protection [Diagram 2]. Reach considerations – The distanced reached across multimode fiber cabling from the optical splitter to the ONT is 550 meters for the 2x8, or 2x16 SM-MM optical splitters. The distance reached from the OLT to optical splitter is dependent on the insertion loss of the optical splitters. Insertion loss increases with the increase number of the split ratio (e.g. 2x8=11.5dB, 2x16=15dB). Distance reached is inversely related to loss and split ratios (e.g. 2x8=20km, 2x16=10km). It is best to consult the online Tellabs’ SM-MM optical splitter data sheets to confirm the insertion loss and associated reach of the different optical splitters. RF video overlay option – The optical splitters support the operations of wavelengths between 1260nm and up to 1625nm. That means that RF video overlay using the 1550nm wavelength is supported. However, special care should be taken and this it is recommended to work with a Tellabs subject matter expert when implementing RF video overlay using the SM-MM optical splitter.

Diagram 2.

Diagram 3.

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Diagram 4. Extended deep fiber (or zone enclosure design) – For this layout, the OLT sits in main data center with the MDF, singlemode fiber is used between main data center through the telecommunications closets and multimode fiber runs within the telecom closet plus IDF, and out to the access network drops. The CATx copper cabling is only used for the final connectivity between the wall ONTs and Desktop ONTs for the last 100m drops to the connected and powered devices. Tellabs SM-MM optical splitter can be positioned in a telecom closet, wall enclosure, floor enclosure or ceiling enclosure. The Tellabs wall ONTs (e.g. ONT140W) and desktop ONTs (e.g. ONT140C, ONT142R, ONT180C) are utilized in this design [Diagram 4]. Campus wide reach – In this case, the campus network has singlemode fiber between buildings, to the main data center, and multimode fiber within the building. The OLT can be positioned in one building’s main data center, and then you can pick either an extended deep fiber or closed-based switch replacement within each of the buildings spread-out across a campus (e.g. college campus, military base, sprawling resort) [Diagram 5].

What Else is Possible? The flexibilities are endless and there are many other possibilities currently being engineered. The CATx copper, multimode fiber and singlemode fiber cabling is likely to appear in many locations within a building and across a campus. Therefore, other optical splitters variations that are currently being investigated are: Multimode to singlemode options Multimode to multimode choices

Multimode to singlemode options – In the expansive properties, there may be a mixture of both multimode fiber and singlemode fiber cabling building-to-building, to-the-datacenters and to-the-closets. In order to deliver the maximum network design flexibility, a multimode-to-singlemode optical splitter could be used. Multimode to multimode choices – There are known facilities with end-to-end multimode fiber cabling. These properties installed multimode fiber to future-proof their network infrastructure, and in these cases, a multimode-to-multimode optical splitter would be a welcomed option.

Many possibilities with Tellabs FlexSym Optical Splitters! Passive Optical Networking has been focused on the advantage of single mode fiber cabling inherent supremacy. However, multimode fiber cabling does exist inside buildings and across a in the raisers, horizontals and drop pathways. In the past, those customers that already had multimode fiber were forced to factor in the cost of replacing that multimode fiber with singlemode fiber cabling – that burdened the Optical LAN upgrade project with additional time, material and labor. Now, with the better economics and design flexibilities gained with the Tellabs FlexSym Singlemode to Multimode Optical Splitters, we are seeing an acceleration of government and commercial customers moving forward Passive Optical LAN.

Diagram 5.

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